From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The failure of connecting rods from a 93-NK car, noting issues with whitemetal adhesion.
| Identifier | ExFiles\Box 65\4\ scan0272 | |
| Date | 1st June 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. X8030 REF. Hs{Lord Ernest Hives - Chair}1/LG4.6.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} EAC 'V' SERIES. CONNECTING RODS. X.8030 We have received from France a set of connecting rods taken off 93-NK car. The con. rod bearings were found in a very poor condition when the rods were being dismantled in order to fit new piston rings. We are sending the rods to WW. This is the third occasion on which the connecting rod bearings have failed in 21,000 miles. The last set of rods have run just over 8,000 miles. It is reported that during this last run the oil has never dropped below 18 lbs. pressure. We know that it is difficult to get whitemetal to adhere properly to alloy steel rods. The 20 HP. is by no means free from this trouble. We are preparing a set of rods on which the white-metalling has been carried out very carefully. Hs.{Lord Ernest Hives - Chair} | ||